<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <i>asd</i>
    <div>123</div>
    <span>ww</span>
    <script>
        var div = document.querySelector("div");
        var span = div.nextElementSibling;
        console.log(span);
        var i = div.previousElementSibling;
        console.log(i);
    </script>
</body>

</html>